Originally Posted by nhsilversti
lets just use my ford excursion as a quick example
8000# truck with 7.3L diesel.
when doing 65-68mph on highway i can get 25-26mpg
68-71 is 20
71-75 is 18
75+ is 16ish
By continuing that trend, I can estimate that your average mpg is close to around 8mpg?